Safety recommendation SL no. 2019/01T

On 21 June 2018 OH-HNX, a helicopter from Heliwest hit a crossing power line and cut all three conductors. The risk of collision with crossing lines is very real in connection with helicopter work at low altitude along power lines. This is e.g. illustrated by the fact that, over a six-month period, Agder Energi Nett had three incidents in connection with work along the company's power distribution network. Sweden and Finland have introduced requirements for physical marking of power lines before they are crossed by overhead cables. The AIBN believes such marking could, to a substantial degree, prevent the risk of collision.

The Accident Investigations Board Norway recommends that the Civil Aviation Authority introduce requirements for physical marking of crossing lines in Norway.

Safety recommendation SL No. 2018/16T

19 September 2017, LN-ABF crashed near Hamar airport Stafsberg. The AIBN considers that the simplification in EASA and the national regulations may be negative for aviation safety in some areas. AIBN does not advocate changes in today’s regulations that would result in a reversal of the simplification, but generally considers that a set criteria regarding the contents and duration of familiarization training for new aircraft models in order to assist pilots to fulfil the requirements in EASA OPS Part-NCO.GEN.105 should be enforced. If possible, a qualified flight instructor should be used, but if the pilot chooses to do a self-familiarization on a new aircraft model, the CAA should issue some criteria or requirements as an aid to this familiarization. Such criteria may consist of everything from studying the Pilot Operating Handbook (or equivalent), pre-flight inspection of the aircraft, engine start, taxing, operation of systems on board, take-off and landings in different wind conditions, steep turns, slow flights, stalls and climbs and descents in turns; to emergency procedures and so on. Furthermore the AIBN considers that the CAA with advantage could issue a form or a checklist to be signed subsequent to each item being successfully performed.

The Accident Investigation Board Norway recommends that the Civil Aviation Authority Norway consider whether the current policy, which opens for pilots to do a self-familiarization on new aircraft models within the same class of aircraft without of any documentation of having met a minimum regarding contents and duration, is acceptable from a flight safety point of view.

Safety recommendation SL No. 2018/17T

19 September 2017, LN-ABF crashed near Hamar airport Stafsberg. The Aircraft Flight Manual (AFM) found in LN-ABF was not complete. The few pages that were on board the airplane were only single sheets of paper. The approved flight manual and accompanying documents is the basis in connection with familiarization on new aircraft models and the AFM shall be carried on board during flight. In connection with annual aircraft certification, no routines currently exist to verify that the flight manual is on board .

The Accident Investigation Board Norway recommends the Civil Aviation Authority Norway to consider whether routines should be added to verify that the Aircraft Flight Manual exists on board in connection with annual aircraft certifications.

Safety recommendation SL No 2018/15T

22 August 2017, LN-PTS crashed near Holmestrand. In connection with weighing of aircrafts, it exists a requirement of a new weighing if the empty mass has been changed more than +/- 0,5 % of maximum landing mass and/or CG has been changed more than +/- 0,5 % of MAC. Furthermore, it is normally a requirement to do an assessment of the new values with the values from previous weighing. The Accident Investigation Board Norway (AIBN) consider that a form for empty weight and balance should consist of an assessment of the new values with the values from previous weighing. In this case, the airplane’s empty weight and corresponding center of gravity values were not used to make mass and balance calculations. Several studies suggest that general pilots have a relaxed attitude towards these limitations.

The Accident Investigation Board Norway (AIBN) recommends that the Civil Aviation Authority Norway should provide appropriate “Safety promotion” information. From an airworthiness point of view, measures should be taken to make probability assessments of new values in connection with weighing. Furthermore, information should be provided on the importance of flight operation personnel complying with the limitations announced in the aircraft’s manuals.